A method for removing corrosion products from an aeroengine part based on field sampling

Abstract

The application discloses a kind of aviation engine parts corrosion product removal methods based on field in-situ, any one of selected tomato, lemon and hawthorn is mixed with water and heated to prepare treatment fluid, the aviation engine parts to be treated is completely immersed in treatment fluid and is boiled and washed, after boiling and washing, aviation engine parts is taken out and rinsed with clean water and dried, it can be checked its surface metal gloss and damage state by visual inspection, magnifying glass or endoscope.The application provides a kind of in-situ material, simple operation and reliable technical means, solves the problem that aviation engine parts corrosion product is difficult to be efficiently removed under field environment, while meeting the stringent requirements of aviation engine parts on material damage control.

Description

Technical Field

[0001] This invention belongs to the field of aero-engine maintenance and support technology, specifically a method for removing corrosion products from aero-engine parts in field environments. It is particularly suitable for battlefield emergency repairs, remote area maintenance, and other field scenarios without industrialized conditions, and can efficiently remove corrosion products from key aero-engine parts such as nickel-based alloys and titanium alloys. Background Technology

[0002] In field maintenance and support scenarios for aero-engines, such as emergency battlefield repairs and sudden malfunction maintenance in remote areas, the lack of industrialized maintenance facilities like laboratories and chemical plants, coupled with the absence of chemical reagents like sulfuric acid and phytic acid, and specialized equipment such as high-pressure water jetting and plasma polishing, presents a critical challenge in removing high-temperature oxide scale (such as Al2O3 and Cr2O3) and sulfides (such as NiS and FeS) from the surfaces of aero-engine turbine blades and shaft components. If these corrosion products cannot be effectively removed, technicians cannot accurately inspect the surface conditions of parts, such as cracks and wear. This can lead to maintenance delays (conventional industrial rust removal requires transporting equipment and reagents, taking ≥48 hours), or even affect the reliability of the engine after reassembly and potentially cause flight accidents.

[0003] Currently, there is no specific solution for the efficient removal of corrosion products in the field under conditions where there are no chemical reagents or specialized equipment. There is an urgent need for a technical means that can use locally available materials, is easy to operate, and has reliable results, while also meeting the stringent requirements for material damage control in aero-engine parts. Summary of the Invention

[0004] The present invention aims to provide a method for removing corrosion products of aero-engine parts based on locally sourced materials in the field, thereby solving the problem mentioned in the background art of the difficulty in efficiently removing corrosion products of aero-engine parts in the field environment.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: A method for removing corrosion products from aero-engine parts using locally sourced materials, wherein the aero-engine parts are made of nickel-based alloys, titanium alloys, or aluminum alloys; the method for removing corrosion products includes the following steps: Step 1, Raw material selection and treatment solution preparation: Select any one of tomatoes, lemons, and hawthorns as raw materials; slice the collected tomatoes, lemons, or hawthorns, and then add the tomato slices, lemon slices, or hawthorn slices to water, and mix them evenly according to the mass ratio of tomato slices:water = 1:2~3, lemon slices:water = 1:2~3, and hawthorn slices:water = 1:2~3 to obtain a mixture; Step 2, solution preparation: The mixture obtained in Step 1 is heated and boiled to obtain the treatment solution; Step 3: Remove corrosion products by completely immersing the aircraft engine parts to be treated in the treatment solution obtained in Step 2 and heating to boiling to achieve washing. Step four, cleaning: After boiling and washing in step three, take out the aircraft engine parts, rinse them with clean water and let them air dry. Inspect the metallic luster and damage condition of the aircraft engine parts.

[0006] As an alternative: in step one, the tomato slices are 3mm to 8mm thick, and the lemon and hawthorn slices are 2mm to 5mm thick.

[0007] Alternatively, in steps two and three, the heating device may be an induction cooker or a fuel heating device.

[0008] As an alternative: in step two, the heating time is 20 to 40 minutes.

[0009] As an alternative: in step three, the boiling time using tomato-based treatment solution is longer than the boiling time using lemon or hawthorn-based treatment solution, and the boiling time for nickel-based alloy and titanium alloy aero-engine parts is longer than the boiling time for aluminum alloy aero-engine parts.

[0010] As an alternative: in step three, for aircraft engine parts of the same material, different treatment solutions with different components from step two are used for boiling and washing, or the treatment solutions with different components are mixed and boiled and washed at once.

[0011] As an alternative: in step four, visual inspection, magnification, or endoscopy is used to examine the metallic luster and damage condition of the aircraft engine parts.

[0012] The method for removing corrosion products from aero-engine parts according to the present invention has the following characteristics: (1) The idea of ​​using plant acids such as tomatoes, lemons, and hawthorns to remove corrosion products in the field maintenance of aero-engines was first proposed. The effectiveness of the reaction was verified for special materials such as nickel-based alloys, titanium alloys, and aluminum alloys, filling the technological gap in this field.

[0013] (2) High practicality: Raw materials are easy to obtain in the wild (tomatoes, lemons, etc. are widely distributed in temperate and subtropical wild environments), and the device is portable and easy to operate (the total weight of stainless steel pot + portable heater is ≤5kg). It can be implemented without professional chemical knowledge, which shortens the time for emergency repair of aircraft engines in the field by more than 50%.

[0014] (3) Good effect in removing corrosion products: Through the targeted reaction of organic acid with corrosion products, more than 90% of high-temperature oxide scale and sulfides can be removed within 15 minutes, and the surface of the parts shows a uniform metallic luster, which meets the requirements of visual inspection accuracy (surface damage identification rate ≥98%).

[0015] (4) Good economic efficiency: Compared with carrying industrial rust removers or professional equipment, the cost of material transportation and procurement is reduced by more than 90%; and there is no chemical waste discharge, which is in line with the low-carbon and environmentally friendly development trend of "green maintenance".

[0016] (5) Flexible processing methods: The processing solutions in this invention are prepared separately, namely, processing solutions containing only tomato extract, processing solutions containing only lemon extract, and processing solutions containing only hawthorn extract are prepared, and the three are independent formulation systems. However, when removing corrosion, it is possible to process in steps or to process in combination. The step-by-step processing involves applying different processing solutions to the surface of the aero-engine parts in sequence to remove different types of corrosion in a targeted manner; while the combination processing involves mixing different processing solutions in a certain proportion and then conducting a one-time treatment test to evaluate their synergistic effect. Attached Figure Description

[0017] Figure 1 This is a scene depicting the implementation of boiling and washing aircraft engine turbine blades with an acidic tomato solution. Figure 2 These are before-and-after photos of aircraft engine turbine blades being washed with an acidic tomato solution. Detailed Implementation

[0018] The present invention will be further described below with reference to specific embodiments, but it should not be construed as limiting the scope of the subject matter of the present invention to the following embodiments. All modifications, substitutions and alterations made based on ordinary technical knowledge and common practices in the art without departing from the above-described technical concept of the present invention are included within the scope of the present invention.

[0019] This invention provides a method for removing corrosion products from aero-engine parts based on locally sourced materials, comprising the following steps: (1) Raw material selection and treatment solution preparation: After slicing the collected raw materials (tomato slices 3mm-8mm thick, lemon / hawthorn slices 2mm-5mm thick), add them to water and mix them evenly at a mass ratio of approximately "tomato / lemon / hawthorn slices: water = 1:2-3".

[0020] (2) Solution preparation: After the above-described materials are mixed evenly, they are boiled for 20-40 minutes using an electromagnetic heating furnace (suitable for temporary power supply environments) or a fuel heating device (for power-free scenarios) to obtain an acidic treatment solution containing citric acid and malic acid.

[0021] (3) Rust removal: The nickel-based alloy (such as GH4169) and titanium alloy (such as TC4) parts of the aircraft engine to be treated are completely immersed in the acidic treatment solution and heated to boiling using a portable electromagnetic heating device or fuel heating device. The boiling time for tomato treatment solution is 10-15 minutes, and the boiling time for lemon / hawthorn treatment solution is shortened to 8-10 minutes; for aluminum alloy parts, the boiling time should be controlled at 5-8 minutes to avoid excessive corrosion.

[0022] (4) Cleaning: After boiling and washing, remove the parts, rinse them with clean water and let them air dry. Then you can inspect their surface metallic luster and damage by visual inspection, magnifying glass or endoscope. The three materials can be flexibly replaced according to the actual conditions available in the field.

[0023] Example 1: GH4169 nickel-based alloy turbine blades were treated with tomato-based treatment solution.

[0024] Collect 2 kg of fully ripe wild tomatoes and slice them into 5 mm thick slices; like Figure 1 Add 4L of water to a 304 stainless steel container, add tomato slices, and heat and simmer for 30 minutes using a portable induction heater. The GH4169 nickel-based alloy turbine blades to be inspected were placed in the treatment solution, heated to 90°C, and continuously boiled for 15 minutes. Remove the leaves, rinse them with clean water, and let them air dry. Figure 2 Visually, the oxide scale (Al2O3, Cr2O3) on the leaf surface was completely dissolved, showing a uniform silvery-gray metallic luster. It was possible to clearly identify whether there were cracks, pits or other damage on the surface. The roots of the unwashed leaves were still covered with a brownish-brown corrosion layer about 40μm thick, and the damage condition could not be determined.

[0025] Example 2: The TC4 titanium alloy shaft is treated with lemon solution.

[0026] Collect 1 kg of ripe wild lemons and slice them into 3 mm thick slices; Simmer for 25 minutes using a lemon:water ratio of 1:3 (by weight and volume). Place the TC4 titanium alloy shaft into the treatment solution and heat it to 85°C for 10 minutes. After the small shaft was removed, the TiO2 oxide scale on its surface completely dissolved, and the light gray metallic luster was clearly visible, meeting the inspection requirements for dimensional accuracy and surface condition.

[0027] Example 3: Comparative experiment (tomato juice vs. water vs. industrial citric acid).

[0028] Take three identical GH4169 nickel-based alloy test pieces and place them in tomato treatment solution, water, and industrial citric acid (pH=3.5) respectively, and boil them at 90℃ for 15 minutes. The weight loss method test showed that the rust removal efficiency of the tomato treatment solution group was 92%, the industrial citric acid group was 95% (there was no significant difference between the two), and the water group was only 5%. Metallographic observation showed that neither the tomato treatment solution group nor the industrial citric acid group caused thermal damage or changes in metallographic structure to the parts, verifying the equivalence of the on-site material sourcing solution of the present invention.

[0029] In summary, the method and apparatus of this invention are highly efficient, original, and practical in removing corrosion products from nickel-based alloy, titanium alloy, and aluminum alloy parts of aero-engines in field environments. They can be widely used in field maintenance and support work such as battlefield emergency repair and maintenance in remote areas of aero-engines, and have important military and engineering application value. At the same time, they are in line with the industry development trend of green maintenance.

[0030] This invention presents a natural and environmentally friendly method for removing corrosion products. For the first time, it applies extracts from natural plants such as tomatoes, lemons, and hawthorns to the surface treatment of aero-engine parts, replacing traditional highly corrosive chemical reagents and achieving green and environmentally friendly manufacturing. The method offers flexibility, innovatively proposing two process paths: "step-by-step treatment" and "hybrid treatment," which can be flexibly selected based on the type of corrosion and the material of the part, improving the adaptability and controllability of the process. Furthermore, this method exhibits high substrate compatibility, validating its effectiveness on various aerospace materials such as nickel-based alloys, titanium alloys, and aluminum alloys. It also shows initial potential for application on other materials (e.g., stainless steel, high-temperature alloys), laying the foundation for subsequent engineering applications.

[0031] Contents not described in detail in this specification are prior art known to those skilled in the art. Although illustrative specific embodiments of the invention have been described above to facilitate understanding by those skilled in the art, it should be understood that the invention is not limited to the scope of the specific embodiments. Various modifications are readily apparent to those skilled in the art as long as they fall within the spirit and scope of the invention as defined and determined by the appended claims, and all inventions utilizing the concept of this invention are protected.

Claims

1. A method for removing corrosion products from aero-engine parts based on locally sourced materials, characterized in that: The materials of the aero-engine parts are nickel-based alloys, titanium alloys, or aluminum alloys; The method for removing corrosion products includes the following steps: Step 1, Raw material selection and treatment solution preparation: Select any one of tomatoes, lemons, and hawthorns as raw materials; slice the collected tomatoes, lemons, or hawthorns, and then add the tomato slices, lemon slices, or hawthorn slices to water, and mix them evenly according to the mass ratio of tomato slices:water = 1:2~3, lemon slices:water = 1:2~3, and hawthorn slices:water = 1:2~3 to obtain a mixture; Step 2, solution preparation: The mixture obtained in Step 1 is heated and boiled to obtain the treatment solution; Step 3: Remove corrosion products by completely immersing the aircraft engine parts to be treated in the treatment solution obtained in Step 2 and heating to boiling to achieve washing. Step four, cleaning: After boiling and washing in step three, take out the aircraft engine parts, rinse them with clean water and let them air dry. Inspect the metallic luster and damage condition of the aircraft engine parts.

2. The method for removing corrosion products from aero-engine parts based on locally sourced materials according to claim 1, characterized in that: In step one, the tomato slices are 3mm to 8mm thick, and the lemon and hawthorn slices are 2mm to 5mm thick.

3. The method for removing corrosion products from aero-engine parts based on locally sourced materials according to claim 1, characterized in that: In steps two and three, the heating equipment is an induction cooker or a fuel heating device.

4. The method for removing corrosion products from aero-engine parts based on locally sourced materials in the field, as described in claim 1, is characterized in that: In step two, the heating time is 20 to 40 minutes.

5. The method for removing corrosion products from aero-engine parts based on locally sourced materials in the field, as described in claim 1, is characterized in that: In step three, the boiling time using tomato-based treatment solution is longer than that using lemon or hawthorn-based treatment solution, and the boiling time for nickel-based alloy and titanium alloy aero-engine parts is longer than that for aluminum alloy aero-engine parts.

6. The method for removing corrosion products from aero-engine parts based on locally sourced materials in the field, as described in claim 1, is characterized in that: In step three, for aircraft engine parts made of the same material, different treatment solutions with different components from step two are used for boiling and washing, or the treatment solutions with different components are mixed and boiled and washed at once.

7. The method for removing corrosion products from aero-engine parts based on locally sourced materials according to claim 1, characterized in that: In step four, the metallic luster and damage condition of the aircraft engine parts are inspected visually, using a magnifying glass or endoscope.

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